Cengane Dam is currently under construction in the Eastern Cape Province. It is the storage dam for the Culunca Water Supply Scheme, which provides water for approximately 45 000 people. The scheme is located 80 kilometers north of Mthatha, about 15 kilometres to the northwest of the village of Qumbu.
The 17 metre high dam comprises an earthfill embankment with a concrete lined chute spillway on the left flank of the river. The concrete lined spillway is designed to carry a 1 in 100 year design flood of 126 cubic metres per second, while the safety evaluation flood of 430 cubic metres per second is carried by an auxiliary unlined spillway adjacent the main spillway. The temporary works feature a diversion dam, designed for overtopping, which acts as a cofferdam and raises the water to the level of the permanent outlet pipe through the main wall, so maintaining the supply of water to the downstream treatment works.
Construction commenced in May April 2012 and the dam is scheduled for completion by August 2013.
The client for the project is OR Tambo District Municipality. The design and construction supervision of the dam is being carried out by HHO Africa. The contractor is Norland Construction.